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Perhaps there actually isn't any greater increase in pressure inside the primer? Or if there is an increase it is not a sufficient increase to pose any problem or danger.
I don't know the answer but I tend to agree that it's not an issue at SAAMI...

Same cartridges are 65,000 PSI SAAMI. Priming compound will not produce 65K. With the smokeless muzzloaders some loads are over 50K using a primer designed for a 14.5K max cartridge. The small vent liners restrict the gas pressure enough so it's...

http://bulletin.accurateshooter.com/2013/05/large-vs-small-flash-holes-in-308-win-brass/
I never was concerned about increased pressure of the powder charge from larger flash holes. I do have a mild concern about increased pressure in the primer...

I have a Browning 1886 rifle and a saddle ring carbine. Never had any issues so I never took them apart. I have no idea how close to original they are. I picked up the saddle ring cheap due to some deep stock scratches. Just picked up a blank...

One more point on the tolerancing. Normally manufactures tend to shoot for the middle of the tolerance. With gage pins they tend to be very close to the plus or minus tolerance. A .0002 plus will be very close to .0002" over and a .0002" under...

Either one will work for you. Most use the minus tolerance (.0000,-.0002) pins. The tolerance selection is mostly to ensure the pin tolerance doesn't allow a bad part. Example it a hole with 1.000" max and a .999" min. You would select a minus...

http://military.wikia.com/wiki/7.92x94mm_Patronen
Details of the round
The round originally had a steel core and a tiny capsule of tear gas. The round was to penetrate the armor of the tank and the tear gas to force out the occupants of the...

50 deer a year is for crop damage control is not that many. A very good friend is LE is involved with metro deer management and damage control in non-hunting areas. He is one of the assigned shooters. They use suppressed rifles with night vision...

For competitive long range shooting I don't purchase smaller the 8 pound jugs to minimize lot to lot load development. Powders like Varget are purchase 32 pounds at a time requested to be all the same lot. Normally with matching velocities...

In some cases it is true. Large volume cases are not effected as much by deeper seating. Deeper seating does increase pressure, however, more distance to the bullet engaging the lands reduces pressure. That is why Weatherby used such long throat....

Opinions are strong on this subject. Lots of good and bad info out there. I was always a believer in aging if I could hold the temperature properly but I never actually tested my belief. About 15 years ago I split a medium sized buck in half and...